man mga (Fichiers spéciaux) - Matrox video driver


mga - Matrox video driver


Section qDeviceq
  Identifier qdevnameq
  Driver qmgaq


mga is an Xorg driver for Matrox video cards. The driver is fully accelerated, and provides support for the following framebuffer depths: 8, 15, 16, 24, and an 8+24 overlay mode. All visual types are supported for depth 8, and both TrueColor and DirectColor visuals are supported for the other depths except 8+24 mode which supports PseudoColor, GrayScale and TrueColor. Multi-card configurations are supported. XVideo is supported on G200 and newer systems, with either TexturedVideo or video overlay. The second head of dual-head cards is supported for the G450 and G550. Support for the second head on G400 cards requires a binary-only "mga_hal" module that is available from Matrox <>, and may be on the CD supplied with the card. That module also provides various other enhancements, and may be necessary to use the DVI (digital) output on the G550 (and other cards).


The mga driver supports PCI and AGP video cards based on the following Matrox chips. They are listed in approximate chronological order of production (with the most recent chipsets listed last), so consult this list when you are unsure whether your card is meant when references are made to G200 and later chips, for example.

Millennium II
Productiva G100
Millennium G200 and Mystique G200
Millenium G400, Millenium G400 MAX, Millenium G450, and Marvel G450 eTV
Millenium G550 and Millenium G550 Dual DVI


Please refer to xorg.conf(5) for general configuration details. This section only covers configuration details specific to this driver.

The driver auto-detects the chipset type, but the following ChipSet names may optionally be specified in the config file qDeviceq section, and will override the auto-detection:

"mga2064w", "mga1064sg", "mga2164w", "mga2164w agp", "mgag100", "mgag200", "mgag200 pci", "mgag400", "mgag550".

The G450 is Chipset "mgag400" with ChipRev 0x80.

The driver will auto-detect the amount of video memory present for all chips except the Millennium II. In the Millennium II case it defaults to 4096 kBytes. When using a Millennium II, the actual amount of video memory should be specified with a VideoRam entry in the config file qDeviceq section.

The following driver Options are supported:

Option qColorKeyq qintegerq
Set the colormap index used for the transparency key for the depth 8 plane when operating in 8+24 overlay mode. The value must be in the range 2-255. Default: 255.
Option qHWCursorq qbooleanq
Enable or disable the HW cursor. Default: on.
Option qMGASDRAMq qbooleanq
Specify whether G100, G200 or G400 cards have SDRAM. The driver attempts to auto-detect this based on the card's PCI subsystem ID. This option may be used to override that auto-detection. The mga driver is not able to auto-detect the presence of of SDRAM on secondary heads in multihead configurations so this option will often need to be specified in multihead configurations. Default: auto-detected.
Option qNoAccelq qbooleanq
Disable or enable acceleration. Default: acceleration is enabled.
Option qNoHalq qbooleanq
Disable or enable loading the "mga_hal" module. Default: the module is loaded when available and when using hardware that it supports.
Option qOverclockMemq
Set clocks to values used by some commercial X Servers (G100, G200 and G400 only). Default: off.
Option qOverlayq qvalueq
Enable 8+24 overlay mode. Only appropriate for depth 24. Recognized values are: "8,24", "24,8". Default: off. (Note: the G100 is unaccelerated in the 8+24 overlay mode due to a missing hardware feature.)
Option qPciRetryq qbooleanq
Enable or disable PCI retries. Default: off.
Option qRotateq qCWq
Option qRotateq qCCWq
Rotate the display clockwise or counterclockwise. This mode is unaccelerated. Default: no rotation.
Option qShadowFBq qbooleanq
Enable or disable use of the shadow framebuffer layer. Default: off.
Option qSyncOnGreenq qbooleanq
Enable or disable combining the sync signals with the green signal. Default: off.
Option qUseFBDevq qbooleanq
Enable or disable use of on OS-specific fb interface (and is not supported on all OSs). See fbdevhw(4) for further information. Default: off.
Option qVideoKeyq qintegerq
This sets the default pixel value for the YUV video overlay key. Default: undefined.
Option qTexturedVideoq qbooleanq
This has XvImage support use the texture engine rather than the video overlay. This option is only supported by G200 and later chips, and only at 16 and 32 bits per pixel. Default: off.
Option qOldDmaInitq qbooleanq
This forces the driver to use the old DMA initialization path for DRI. Use this option only to support a older version of the DRI driver with a newer DRM (version 3.2 or later). This option also disables the use of direct rendering on PCI cards. Default: off.
Option qForcePciDmaq qbooleanq
This forces the use of PCI DMA even if AGP DMA could be used. This option is primarily intended for testing purposes, but it could also be used on systems with a buggy or poorly function AGP implementation. Default: off.



Authors include: Radoslaw Kapitan, Mark Vojkovich, and also David Dawes, Guy Desbief, Dirk Hohndel, Doug Merritt, Andrew E. Mileski, Andrew van der Stock, Leonard N. Zubkoff, Andrew C. Aitchison.